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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '956c49dca46e5208fbc00ae3b8b4734f252dd7bf6af5442f64d903260681a67b' 
  AND token = 'TYi4vogRoAbfrfrG257/vZdGI9350rGGtT/12/V3Sso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}